Port 1222
nerv · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | nerv |
Frequently asked questions
What is port 1222 used for?
Port 1222 is registered with the IANA for nerv (TCP/UDP). Description: SNI R&D network.
Is port 1222 a well-known port?
No. Port 1222 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 1222 is open?
Locally on Linux with ss -tulpn | grep ':1222\b', on Windows with netstat -ano | findstr :1222. To test a remote host use Test-NetConnection <host> -Port 1222 in PowerShell or nc -zv <host> 1222 on Linux/macOS.
How do I open port 1222 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 1222/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=1222/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 1222" -Direction Inbound -Protocol TCP -LocalPort 1222 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | nerv | SNI R&D network |
| UDP | nerv | SNI R&D network |